316 THE KINDS OF PLANTS 



EB. Perianth-tube adherent to ovary wholly or partly: 

 flowers perfect. 



F. Anthers 3 Iridaceae, p. 337 



FF. Anthers 6 Amaryllidaceae, p. 335 



FFF. Anthers 1 or 2, united with pistil, gynandrous 



Orchidacex, p. 339 



cc. Dicotyledons: cotyledons 2 or more: leaves mostly netted- 

 veined, usually falling with a distinct joint or articula- 

 tion: stem with concentric layers of wood when more 

 than one year old (exogenous), and a distinct separable 

 bark: flowers mostly 5-merous or 4-merous (comprising 

 the remainder of this key). 



D. Choripetalae: petals distinct or wanting (i. e., flowers 

 polypetalous, apetalous or naked, in distinction from 

 gamopetalous, DD, p. 319). 

 E. Flowers characteristically apetalous; mostly small and 



often greenish, inconspicuous. 

 F. Plants woody. 



G. The flowers monoecious or dioecious, one or both 



sorts in catkins. 



H. Fertile flowers in short catkins or heads: calyx 

 regular in the pistillate flower, becoming 



fleshy or juicy in the fruit (juice milky) 



Urticacese, p. 345 



HH. Fertile flowers 1-3 in a cup-like involucre: 

 or 2 or 3 at each scale of the pistillate catkin: 

 fruit dry, often winged, or a 1-seeded nut: 



sterile fls. in elongated catkins Cupuliferae, p. 342 



GG. The flowers not in catkins. 



H. Calyx-tube adherent to ovary: climbing 



Aristolochiacese, p. 348 

 HH. Calyx-tube hypogynous. 

 i. Leaves opposite. 



j. Fruit a double samara, 2-winged 



Sapindacex, p. 343 

 jj. Fruit a single-winged samara or 1-seeded 



drupe: stamens 2 Oieacese, p. 388 



jjj. Fruit not winged: 3-seeded: stamens 4 



Euphorbiaceae, p. 351 

 ii. Leaves alternate. 



j. Styles or stigmas 2 or 2-cleft; stamens 

 equal the calyx-lobes and opposite to 



them Urticaceae, p. 345 



jj. Styles or stigmas 3, each 2-cleft: pod 3- 

 celled and 3-seeded: flowers 3-parted: 

 fruit a dry capsule: stamens 8 to many.. . 



Euphorbiaceae, p. 351 



